Effect of Geomagnetic Storms and Their Association with Solar Wind Velocity during 1996-2016

In the present study we shows the results on interplanetary causes of large geomagnetic storms (Dst ≤ -100nT to Dst ≤ -200nT), that occurred during solar cycle 23 and 24 (1996–2016). Space weather in the near-earth environment is directly associated to disturbances originating at the Sun. It is found that total number of large geomagnetic storms (Dst≤-100nT) were observed 88. WE conclude that large storms associated with CMEs were 43, associated with CMEs and solar flares (B-class and M-class), and however associated with only flare is 27. However, the relative importance of each of those driving structures has been shown to vary with the solar cycle phase.